import * as math3d from 'math3d';
const v = new math3d.Vector3(1, 2, 3);
v.add(new math3d.Vector3(0, 0, 1));
new math3d.Matrix4x4([1,1,1,1,
                      2,2,2,2,
                      3,3,3,3,
                      4,4,4,4]);
